Journal of King Saud University, Engineering Sciences最新文献

Upshot of unified power flow controller on the minimization of the severity of overloading on electric power grid 统一功率流控制器对最大限度降低电网过载严重程度的启示

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2021.10.010

{"title":"Upshot of unified power flow controller on the minimization of the severity of overloading on electric power grid","authors":"","doi":"10.1016/j.jksues.2021.10.010","DOIUrl":"10.1016/j.jksues.2021.10.010","url":null,"abstract":"<div><p>With the objective of discovering the vital line in an electrical power grid (EPG) where the unified power flow controller (UPFC) could be inserted to minimize the severity of overloading (SOL) during contingencies, an investigation into the stiffness of single line contingencies (SLC) on the EPG is presented in this study. An overloading index (OVI) is developed and used in this contribution to arrange the transmission branches of the EPG based on their cruciality and criticality throughout SLC. A harmony search algorithm (HSA), an optimization method, has been adopted to optimally set the parameters of the UPFC to achieve the best minimum SOL of the system at the optimal location. The IEEE 30-bus network was used as the test bed. Results based on the test bed show that placing a UPFC based on the ranking of a well-known contingency severity index (CSI) minimized the SOL to <span><math><mrow><mn>2.40</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>10</mn></msup></mrow></math></span> as against the <span><math><mrow><mn>8.05</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>5</mn></msup></mrow></math></span> obtained when the placement is done on the ranking based on the proposed OVI. The minimization of SOL is achieved with a reactance and reactive power of <span><math><mrow><mn>0.036</mn><mi>p</mi><mi>u</mi></mrow></math></span> and <span><math><mrow><mn>0.096</mn><mi>p</mi><mi>u</mi><mo>,</mo></mrow></math></span> respectively, of the UPFC. The result also reveals that the proposed OVI identifies with a higher level of precision the vital line in the test bed for placing the UPFC for the purpose of minimizing the SOL during contingencies.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363921001495/pdfft?md5=ad16a973e1cd6a638fc3bffbd7138b43&pid=1-s2.0-S1018363921001495-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90719171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogen production from microbial electrolysis cells powered with microbial fuel cells 利用微生物燃料电池驱动微生物电解池制氢

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.05.008

引用次数: 0

Optimization of equivalent modulus of RAP-geopolymer-soil mixtures using response surface methodology 利用响应面法优化 RAP-地聚合物-土壤混合物的等效模量

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.06.005

{"title":"Optimization of equivalent modulus of RAP-geopolymer-soil mixtures using response surface methodology","authors":"","doi":"10.1016/j.jksues.2022.06.005","DOIUrl":"10.1016/j.jksues.2022.06.005","url":null,"abstract":"<div><p>This study focuses on assessing the resilient characteristics of a clayey soil modified with a fly ash (FA)-based geopolymer and reclaimed asphalt pavement (RAP) as an unpaved road material. RAP-geopolymer-soil mixtures were designed using the response surface methodology-central composite design with 0–40% RAP and 0–25% FA. The repeated-load California bearing ratio (CBR) testing method was used to determine the recoverable and permanent deformations and then obtain the equivalent (resilient) modulus (M<sub>equ</sub>). The M<sub>equ</sub> values were used to develop predictive models and determine the optimum soil–RAP–geopolymer mixture. The effects of the load level and soaking period on the stiffness of the optimum mixture were also investigated. The results revealed that the geopolymer binder played a significant role in enhancing the stiffness of the mixtures, with the maximum M<sub>equ</sub> obtained at 25% FA and 0% RAP. However, it was determined that RAP has an adverse effect on the stiffness for almost all the studied cases and more significantly for the 40% RAP and 0% FA mixture. The optimal mixture was found to be 25% FA and 30% RAP. The developed model exhibited excellent predictive capability based on ANOVA results. The optimum mixture exhibited stress-softening behavior at an increased load level. No clear trend was observed in the effect of the soaking period on the resilient modulus within the examined soaking period range. Overall, this study agrees with several pavement design guidelines to limit the RAP content used in road applications owing to uncertain adequacy. Additionally, it suggests that the geopolymer binder is an effective stabilizer with excellent environmental and economic potential.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S101836392200071X/pdfft?md5=d70544c6ced55716845d13da4c25dc47&pid=1-s2.0-S101836392200071X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robust decentralized plug and play voltage tracker of islanded microgrids under loads and lines uncertainties by the invariant ellipsoids 利用不变椭球计算负载和线路不确定性条件下孤岛微电网的稳健分散式即插即用电压跟踪器

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2021.12.006

{"title":"Robust decentralized plug and play voltage tracker of islanded microgrids under loads and lines uncertainties by the invariant ellipsoids","authors":"","doi":"10.1016/j.jksues.2021.12.006","DOIUrl":"10.1016/j.jksues.2021.12.006","url":null,"abstract":"<div><p>Microgrids (MGs) comprising of distributed generation units (DGs) are subjected to plug-and-play operation (PnP), lines (connecting the DGs) parameters uncertainty, and load changes. Robust stability and an authentic operation for islanded microgrids can be guaranteed through a robust decentralized voltage tracker developed in this paper. The proposed controller design has the following merits: 1) fully decentralized, 2) scalable, and 3) maintains robust stability against PnP of DGs, load changes, and lines parameters’ uncertainties. A sufficient condition is developed by linear matrix inequality convex optimization is exploited to solve the problem. The MGs’ changes in load and the line's parameters are modelled as norm-bounded uncertainties. The suggested controller uses local measurements from DGs, i.e., decentralized by the decomposition of the global system into subsystems. For each subsystem, the rest of the system's impact is considered disturbances, whose influence must be minimized. The proposed disturbance rejection control algorithm is based on the method of invariant-ellipsoids. Several time-domain scenarios such as connecting and disconnecting a number of DGs, local load changes, and variation of transmission line parameters are executed to assess the suggested controller's effectiveness, using MATLAB /Sim PowerSystems Toolbox.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363921001847/pdfft?md5=de30dfee9ef25af6bb48ce9230588dc9&pid=1-s2.0-S1018363921001847-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78324729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical sensorless control of a rotor-tied DFIG wind energy conversion system using a high gain observer 利用高增益观测器实现转子并联 DFIG 风能转换系统的无机械传感器控制

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.05.005

引用次数: 0

The impact of the Tropical Water Project on the operation of Darbandikhan dam 热带水项目对达尔班迪汗大坝运行的影响

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.06.003

{"title":"The impact of the Tropical Water Project on the operation of Darbandikhan dam","authors":"","doi":"10.1016/j.jksues.2022.06.003","DOIUrl":"10.1016/j.jksues.2022.06.003","url":null,"abstract":"<div><p>In addition to global warming and population growth, the Turkish and Iranian water projects have negatively affected the water resources in Iraq. Recently, Iran has implemented its largest water project (The Tropical Water Project – TWP). This project aims to store the flowing water in the Sirwan and Zmkan rivers (i.e., tributaries of the Diyala River) to provide irrigation, domestic, and industrial water for areas inside and outside the Diyala River Basin. The Darbandikhan dam and Halabja water supply project are located on the Diyala River. In this study, the impact of the TWP on the operation of the Darbandikhan dam and Halabja water supply project was investigated. The monthly inflow data of the Darbandikhan dam from September 1991 to December 2017 were used to simulate the operation of the dam using the HEC-ResSim 3.1 package. Two scenarios were adopted for the operation of the Darbandikhan dam. In the first scenario, the Darbandikhan dam operation was simulated without considering the effects of the TWP project.</p><p>In contrast, in the second scenario, the full operation of the TWP project was considered. The results revealed that about 48.4% of the power generation capacity would be lost, and the water surface elevation in the reservoir would be affected significantly due to the TWP project. The water surface elevation would be at or below 443 m for long periods, which will affect the operation of the Halabja water supply project.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363922000629/pdfft?md5=9040f0251568c3274555810dd0514b67&pid=1-s2.0-S1018363922000629-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80563336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Equipment procurement for printed circuit board manufacturing using the analytic hierarchy process 使用层次分析法为印刷电路板制造进行设备采购

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.05.004

{"title":"Equipment procurement for printed circuit board manufacturing using the analytic hierarchy process","authors":"","doi":"10.1016/j.jksues.2022.05.004","DOIUrl":"10.1016/j.jksues.2022.05.004","url":null,"abstract":"<div><p>For optimal equipment procurement in Taiwan, first, the specifications and prices of a product are evaluated. Based on these evaluations, procurement decisions are made. Ensuring accurate evaluation criteria for procurement is a multicriteria decision making (MCDM) problem. Printed circuit board (PCB) manufacturers have not grasped the decision-making factors of the new equipment specification, and they continue to use the previous generation specifications as the decision-making criteria for new equipment; this results in inappropriate evaluation criteria. When new equipment with different specifications is launched, purchasers may still use the specifications of older equipment as a basis for their purchase decisions. For example, thermal power generation specifications are often used to evaluate equipment for nuclear power generation. The difference in criteria renders it difficult to make decisions for new equipment. We proposed the use of a scientific method to establish a set of criteria decision-making models for equipment procurement to help PCB factories accurately evaluate contemporary specifications. This research established criteria for new technologies to help decision makers select the most appropriate method. We used the Delphi method and the analytic hierarchy process (AHP) to provide insights into technological and commercial requirements, and a model was further developed for optimal equipment procurement.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363922000460/pdfft?md5=0e3b54ad17a41191ec5e6c01ee326c38&pid=1-s2.0-S1018363922000460-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86941637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface undulation parameters of continuously variable transmission friction during turning 转弯时无级变速器摩擦的表面起伏参数

Journal of King Saud University, Engineering Sciences Pub Date : 2024-09-01 DOI: 10.1016/j.jksues.2022.06.001

引用次数: 0

The behavior of different clays subjected to a fast-drying cycle for traditional ceramic manufacturing 传统陶瓷制造中不同粘土在快速干燥循环中的表现

Journal of King Saud University, Engineering Sciences Pub Date : 2024-07-01 DOI: 10.1016/j.jksues.2022.05.003

{"title":"The behavior of different clays subjected to a fast-drying cycle for traditional ceramic manufacturing","authors":"","doi":"10.1016/j.jksues.2022.05.003","DOIUrl":"10.1016/j.jksues.2022.05.003","url":null,"abstract":"<div><p>Studies have been widely carried out on drying techniques and equipment. The behavior of clays subjected to drying stages requires further research. This study aims to evaluate the behavior of the clay ceramic body during the different stages of the drying cycle and match the characteristics of the raw materials with the final quality of the pieces. In this work, the behavior of three different clays in terms of drying performance was studied. The clays were selected, and their chemical, mineralogical, and particle size characteristics were measured. The mixture design (DoE) developed 10 formulations and was processed through vacuum extrusion. The samples were subjected to forced drying cycles of 180 min by varying the temperature from 30 to 90 °C and air speed from 1.5 to 4.0 m/s. At the end of the cycle, the retraction was a determining factor for the crack probability indicator, where formulations that obtained ∼10% retraction in the dry zone showed losses >25%. On the other hand, it is could be stated that claystone assists the drying process of the ceramic piece, minimizing losses. The drying sensitivity coefficient (k-factor) presented values that reproduce the number of losses during drying, proving to be a valid tool to relate clay properties, drying conditions, and losses in this process. In this case, drying process losses >25% were observed when the k-factor was from 1.6.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363922000447/pdfft?md5=596f8cc564235872afd4133464ca174b&pid=1-s2.0-S1018363922000447-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78569203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Dioscorea alata stem fibers as eco-friendly reinforcement for composite materials 开发薯蓣茎纤维作为复合材料的生态友好型增强材料

Journal of King Saud University, Engineering Sciences Pub Date : 2024-07-01 DOI: 10.1016/j.jksues.2022.02.003

{"title":"Development of Dioscorea alata stem fibers as eco-friendly reinforcement for composite materials","authors":"","doi":"10.1016/j.jksues.2022.02.003","DOIUrl":"10.1016/j.jksues.2022.02.003","url":null,"abstract":"<div><p>The use of natural fibers instead of synthetic fibers has become a hot topic in the reinforced composite manufacturing industry. However, there are considerable differences in the mechanical properties of natural fibers cited in the literature. These differences could be due to the prevalent use of monothetic analysis. In this paper, the use of a simplified Taguchi technique in novel <em>Dioscorea alata</em> stems fiber processing is proposed to allow for simultaneous evaluation of control parameters such as treatment type, harvest condition, gauge length and chemical treatment temperature to determine the optimal conditions for fiber tensile properties. These fibers were extracted from the stem by means of water retting method before chemical treatment. The tensile properties were determined as per ASTM D3822/D3822M-14. Non-destructive examinations were employed to look into the chemical make-up, thermal, crystalline and morphological characteristics of the fibers. The test results showed an optimum tensile strength of 151 MPa and tensile modulus of 5709.5 MPa. Density was 0.4 g/cm<sup>3</sup> while cellulose, lignin, moisture, hemicellulose and ash contents were 13.1 %, 10.3 %, 9.7 %, 5.0 % and 8.2 % respectively. The treated fibers were thermally stable till 320 °C. The properties of <em>Dioscorea alata</em> stem fiber (DASF) were found to be promising when compared to existing natural fibers, making it a viable candidate for composite material reinforcement.</p></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1018363922000174/pdfft?md5=61a24537f28b2b0d621040cf637f37c2&pid=1-s2.0-S1018363922000174-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89011306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0